Image verification device, image processing system, image verification program, computer readable recording medium, and image verification method

1. An image verification device that checks an input image obtained by photographing an object to be checked against a registered image database,

wherein, in the registered image database, an amount of feature of an image obtained by photographing an object is registered as a registered image, and the registered image includes registered images registered with respect to a plurality of objects,

wherein the image verification device comprises:

a verification score calculating unit that calculates a verification score serving as a score representing a degree of approximation between the objects indicated by the registered images and the object of the input image by using the amount of feature of the input image and the amounts of feature of the registered images;

a relative evaluation score calculating unit that calculates a relative evaluation score serving as a score representing a degree of approximation between one object registered in the registered image database and the object of the input image in comparison with the other objects;

an integrated score calculating unit that calculates an integrated score obtained by weighting the verification score and the relative evaluation score; and

an image verification unit that performs verification of the input image on the basis of the integrated score.

2. The image verification device according to claim 1 , comprising a typical image registering unit that registers an amount of feature typifying a plurality of registered images registered about the same object for each of the plurality of objects as a typical image.

3. The image verification device according to claim 2 , wherein the relative evaluation score calculating unit calculates the relative evaluation score by using the typical image.

4. The image verification device according to claim 3 , wherein the relative evaluation score calculating unit calculates, in a projection space configured between the one object and the other object, a ratio of a degree of approximation between a projection point at which the input image is projected in the projection space or a degree of approximation between the projection point and the one object and a degree of approximation between the projection point and the other object as the relative evaluation score.

5. The image verification device according to claim 3 , wherein the relative evaluation score calculating unit calculates a ratio of a degree of approximation between the object of the input image and the one object and a degree of approximation between the object of the input image and the other object as the relative evaluation score.

6. The image verification device according to claim 3 , wherein the relative evaluation score calculating unit calculates, on an identification boundary configured between the one object and the other object, a distance between the object of the input image and the identification boundary as the relative evaluation score.

7. The image verification device according to claim 2 , wherein the verification score calculating unit calculates the verification score by using the typical image.

8. The image verification device according to claim 7 , wherein the relative evaluation score calculating unit calculates, in a projection space configured between the one object and the other object, a ratio of a degree of approximation between a projection point at which the input image is projected in the projection space or a degree of approximation between the projection point and the one object and a degree of approximation between the projection point and the other object as the relative evaluation score.

9. The image verification device according to claim 7 , wherein the relative evaluation score calculating unit calculates a ratio of a degree of approximation between the object of the input image and the one object and a degree of approximation between the object of the input image and the other object as the relative evaluation score.

10. The image verification device according to claim 2 , wherein the relative evaluation score calculating unit calculates, in a projection space configured between the one object and the other object, a ratio of a degree of approximation between a projection point at which the input image is projected in the projection space or a degree of approximation between the projection point and the one object and a degree of approximation between the projection point and the other object as the relative evaluation score.

11. The image verification device according to claim 2 , wherein the relative evaluation score calculating unit calculates a ratio of a degree of approximation between the object of the input image and the one object and a degree of approximation between the object of the input image and the other object as the relative evaluation score.

12. The image verification device according to claim 2 , wherein the relative evaluation score calculating unit calculates, on an identification boundary configured between the one object and the other object, a distance between the object of the input image and the identification boundary as the relative evaluation score.

13. The image verification device according to claim 1 , wherein the relative evaluation score calculating unit calculates, in a projection space configured between the one object and the other object, a ratio of a degree of approximation between a projection point at which the input image is projected in the projection space or a degree of approximation between the projection point and the one object and a degree of approximation between the projection point and the other object as the relative evaluation score.

14. The image verification device according to claim 1 , wherein the relative evaluation score calculating unit calculates a ratio of a degree of approximation between the object of the input image and the one object and a degree of approximation between the object of the input image and the other object as the relative evaluation score.

15. The image verification device according to claim 1 , wherein the relative evaluation score calculating unit calculates, on an identification boundary configured between the one object and the other object, a distance between the object of the input image and the identification boundary as the relative evaluation score.

16. The image verification device according to claim 1 , wherein the integrated score is an average value of the verification score and the relative evaluation score.

17. The image verification device according to claim 1 , wherein the object is a face of a person.

18. An image processing system comprising:

the image verification device according to claim 1 ; and

an image input device that supplies the input image to the image verification device.

19. An image verification program stored on a non-transitory computer readable medium that checks an input image obtained by photographing an object to be checked against a registered image database,

wherein, in the registered image database, an amount of feature of an image obtained by photographing an object is registered as a registered image, and the registered image includes registered images registered with respect to a plurality of objects,

wherein the image verification program causes a computer to execute a process comprising:

a verification score calculating step of calculating a verification score serving as a score representing a degree of approximation between the objects indicated by the registered images and the object of the input image by using the amount of feature of the input image and the amounts of feature of the registered images;

a relative evaluation score calculating step of calculating a relative evaluation score serving as a score representing a degree of approximation between one object registered in the registered image database and the object of the input image in comparison with the other objects;

an integrated score calculating unit of calculating an integrated score obtained by weighting the verification score and the relative evaluation score;

and an image verification step of performing verification of the input image on the basis of the integrated score.

20. An image verification method that checks an input image obtained by photographing an object to be checked against a registered image database,

wherein, in the registered image database, an amount of feature of an image obtained by photographing an object is registered as a registered image, and the registered image includes registered images registered with respect to a plurality of objects,

wherein the image verification method comprises:

a verification score calculating step of calculating a verification score serving as a score representing a degree of approximation between the objects indicated by the registered images and the object of the input image by using the amount of feature of the input image and the amounts of feature of the registered images;

a relative evaluation score calculating step of calculating a relative evaluation score serving as a score representing a degree of approximation between one object registered in the registered image database and the object of the input image in comparison with the other objects;

an integrated score calculating step of calculating an integrated score obtained by weighting the verification score and the relative evaluation score; and

an image verification step of performing verification of the input image on the basis of the integrated score.